| Autor: |
Lin, Jiangfeng, Zhang, Haiyang, Liang, Junya, Deng, Jianping |
| Předmět: |
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| Zdroj: |
Macromolecular Chemistry & Physics; Oct2015, Vol. 216 Issue 19, p1963-1971, 9p |
| Abstrakt: |
Polymeric particles are constructed by aromatic acetylene derivatives through suspension polymerization approach. Phenylacetylene and 1-naphthylacetylene are used as monomers to conduct suspension polymerization in aqueous media at room temperature by using (nbd)Rh+B-(C6H5)4 as catalyst and polyvinylpyrrolidone (PVP) as stabilizer. The suspension polymerizations provide polymeric particles in high yield (>80%). Scanning electron microscopic images demonstrate that the particles assumed spherical morphology. The key factors influencing the formation of particles are systemically investigated. Under the optimized conditions, i.e., stirring speed being 500 rpm and with PVP as stabilizer in aqueous media, the resulting polyphenylacetylene particles exhibit satisfactory regularity in spherical morphology. Fourier-transform infrared and 1H NMR spectra confirm the occurrence of polymerization, while UV-vis absorption spectra demonstrate the helical structures of the polymer chains constructing the particles. The polymer chains form high cis contents (>87%) according to Raman spectra. Thermogravimetric analysis shows the high thermostability of the particles. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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